Is it a full on period?
With my daughter, I just had light pinkish/orange streaks on the toilet paper for about a day. I later found out that I was experiencing implantation bleeding. (when the embryo burrows into your uterus)
Could you just be spotting?
If it's a period, though - I do not think you're pregnant. The chances of that happening are extremely rare. (if almost not at all)
umm no cuz u started ur period...theres no possible way you could be prego....next time you have sex maybe you should do research on it and how u could be prego and stuf like that...how old are u?